Where Can I Obtain A USPS-Sourced 2026 US Flag Bca Booklet?

You can't buy them on the USPS website. They just aren't there. I do a phone in order whenever I need to restock them. It takes them a bit for the salesperson to find them since I don't have the item #, but they've always sent the order correctly.

The "Stamp Fulfillment Services" office of the USPS puts out the USA Philatelic catalogue/magazine every quarter. The Summer 2026 issue has both the BCA booklet of 20 and the APU booklet of 20 for $16.40 82 cents per stamp, the current first class rate). The catalogue also offers BCA and APU coils, if you want those. In my experience the USPS does a good job making sure that you get the stamps (BCA or APU) that you ordered. Good luck!

As a follow-up, the USPS catalogue numbers (should you need them) are as follows:
686002 for the BCA booklet
686004 for the APU booklet

Henry Gitner might also have one which will be genuine.